Re: [CAD_CAM_EDM_DRO] Re: Question No. 1

sutherland_oz@... wrote:

> Hi Jon, thanks for both the e-mail & the post, I don't know how I
> missed the post reply, I,m going to be using steppers, open loop, so
> I see now that a run away condition is unlikely to be due to a
> hardware failure however a software problem (my own carelessness)
> could lead to damage.

Well, I have knocked the head out of tram and broken off a few
endmills while fooling around with the machine and not watching what
i was doing. Limit switches wouldn't have prevented any of that.

> Am I correct in assuming that apart from end of
> travel, & a home switch, everything else can be taken care of by
> software control?

Yes, I think so.

> As I,m not looking for speed, but accuracy, there
> will be a fair degree of reduction between motor & table, so this
> makes your suggestion of motor mounted switch "anded" to a table
> position home switch very attractive, thanks for the info, Ian
> Sutherland.

I've used this trick a few times, and also have seen it in other systems.

Jon